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• Cannot install ffmpeg via brew on macOS Mojave

  12 juillet 2018, par Savinggrace
  • Xcode 10 beta installed
  • Command line tool for macOS 10.14 installed
  • macOS_SDK_headers_for_macOS_10.14.pkg installed
  • brew update done ;

  When trying to install ffmpeg by brew install ffmpeg, I had un error below :

  tar: Error exit delayed from previous errors.
  
  Error: Failure while executing: tar xf /Users/myname/Library/Caches/Homebrew/texi2html-5.0.tar.gz -C /private/tmp/texi2html-20180712-39689-hmsh90

  Which seems like a problem of Homebrew texi2html-5.0.tar.gz.

  Then using brew info ffmpeg :

  ffmpeg: stable 4.0.1, HEAD
  
  Play, record, convert, and stream audio and video
  
  https://ffmpeg.org/
  
  Not installed
  
  From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ffmpeg.rb
  
  ==> Dependencies
  
  Build: nasm ✔, pkg-config ✔, texi2html ✘
  
  Recommended: lame ✘, x264 ✘, xvid ✘
  
  Optional: chromaprint ✘, fdk-aac ✘, fontconfig ✘, freetype ✘, frei0r ✘, game-music-emu ✘, libass ✘, libbluray ✘, libbs2b ✘, libcaca ✘, libgsm ✘, libmodplug ✘, librsvg ✘, libsoxr ✘, libssh ✘, libvidstab ✘, libvorbis ✘, libvpx ✘, opencore-amr ✘, openh264 ✘, openjpeg ✘, openssl ✘, opus ✘, rtmpdump ✘, rubberband ✘, sdl2 ✘, snappy ✘, speex ✘, tesseract ✘, theora ✘, two-lame ✘, wavpack ✘, webp ✘, x265 ✘, xz ✔, zeromq ✘, zimg ✘, srt ✘

  As is not working, so I just downloaded static FFmpeg binaries for macOS 64-bit from https://evermeet.cx/ffmpeg/ and moved the exec file to /usr/local/bin/ and now ffmpeg works perfectly.

  But I’m still curious to know how to resolve this brew error.

  Thanks in advance if anyone has the solution.

• ffmpeg - Making a Clean WAV file

  10 janvier 2021, par Edward

  I'm looking to batch convert a number of files to audio files using ffmpeg for a game called Star Wars: Jedi Knight: Dark Forces II. The problem I'm having is that ffmpeg seems to be doing something that does so that Jedi Knight can't play the sound file.

  



  Jedi Knight accepts plain old PCM WAV files of various ranges, from 5khz to 96khz, 8 and 16 bit, mono and stereo. This sounds plain and simple. Except for that if one were to create a WAV file using MS Sound Recorder, Jedi Knight could not play it. Speculation was that it added something extra to header or something. But it can play a WAV file created by Audacity, GoldWave or ModPlug Tracker to name a few.

  



  So why not ffmpeg ? Am I using the wrong codec or params ? I took an original sound file from the game and performed the following :

  



  ffmpeg -i "orig_thrmlpu2.wav" -f wav -acodec pcm_s16le -ar 22050 -ac 1 "ffmpeg_thrmlpu2.wav"


  



  The ffmpeg version does not play in the game. ffprobe shows that the ffmpeg version has some Metadata which the original doesn't have. What params should I use to try and get the same WAV format as the original ? Mind you, -ar, -ac and bits aren't the important parts.

  



  Here are the files for you to examine : http://www.edwardleuf.org/Games/JK/thrmlpu2.zip

  


• Intercept and divert graphic output before it hits the linux framebuffer, not using X11

  13 octobre 2018, par Apollo

  I have been researching this issue for about a week, and it may be that I don’t know the right questions to ask.

  I am running a debian distro (Raspbian Stretch on the RaspberryPi). I am not using X11. Instead, I am booting straight to the command line, and will eventually probably boot straight up headless, starting a program at startup or sshing in to interact.

  What I need to do is to start an application (a game engine specifically) that draws graphics to the framebuffer. Then, I need to intercept that stream before it makes it into the framebuffer, so I can work with it in real time.

  Ultimately, I am using ffmpeg to compress and stream video of the output to another Pi. So, I want to be able to start an application and stream its output over a LAN, while still being able to interact with the command line in a separate thread.

  I have the ffmpeg command to pull from /dev/fb0, and have successfully started the graphics application and streamed the content. But, is there anyway to intercept, capture, or redirect that application’s output so it never actually hits the framebuffer ? In my searching I have found many examples of writing to or reading from the framebuffer, but nothing about stopping content before it reaches the buffer.

  I am happy with any solution that uses an existing package or application, or for C or RUST code that accomplishes what I need.

  Thank you